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Related Experiment Videos

When does a random flap die?

S P Campbell1, M L Moss, N E Hugo

  • 1Department of Surgery, Columbia-Presbyterian Medical Center, New York, N.Y.

Plastic and Reconstructive Surgery
|April 1, 1992
PubMed
Summary
This summary is machine-generated.

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Researchers determined the precise time of flap tissue death in reconstructive surgery. They found that critical ischemia time and flap tissue death are nearly identical, occurring between 8 and 12 hours after pedicle construction.

Area of Science:

  • Plastic Surgery
  • Tissue Viability
  • Ischemia Research

Background:

  • Random flaps are crucial in reconstructive surgery, but their viability is limited by ischemia.
  • The exact time of tissue death following critical ischemia is not well-defined.
  • Clinical recognition of flap necrosis occurs days after the actual tissue death.

Purpose of the Study:

  • To determine the precise time of tissue death in random flaps after pedicle construction.
  • To compare the critical ischemia time with the actual onset of flap tissue necrosis.

Main Methods:

  • A 10 x 3 cm reverse McFarlane random flap model was used.
  • Full-thickness skin grafts from the flap were assessed for necrosis at 0, 4, 8, 12, and 16 hours.
  • Necrosis percentage in grafts was compared to control animals to identify non-viable tissue.

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Main Results:

  • Graft necrosis exceeded control levels between 8 and 12 hours post-pedicle construction.
  • This indicates the flap tissue was no longer viable before grafting within this timeframe.
  • The onset of necrosis in skin grafts closely mirrored the critical ischemia time.

Conclusions:

  • Critical ischemia time and flap tissue death are nearly identical.
  • Flap tissue death occurs between 8 and 12 hours after pedicle construction.
  • This finding refines our understanding of flap viability and surgical timing.